Fluid fuel burner



Oct. 8, 1940- H. P. PARRlGlN 217,291

FLUID FUEL BURNER Filed Maron 13, 193s INvIENTosz. Homen- P Pnzmam Bf @MJU Hfroznev Patented Oct. 8, 1940 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates to improvements in fluid fuel burners and the main object is to provide a burner by the use of which the fuel will be thoroughly atomized so that it will burn efficiently.

Another object is to provide a burner which includes a premixing chamber wherein the fuel and atomizing iiuid or steam are premixed and from which they are forced through Venturi tubes into a discharge chamber where they are further mixed and from which the-y emerge through the flame opening of the burner.

Another object is to provide a burner of this kind in a simple comp-act and practical form.

With these and other objects in View the invention resides in the novel construction and arrangement of parts as hereinafter fully set forth and claimed, reference being had to the accompanying drawing as showing a preferred embodiment of my invention for purposes of exempliiication.

In the drawing: Figure l is a rear end elevation of the burner. Figure 2 is a section along the line 2 2 in Figure 1. Figure 3 is a front end View of the burner.

Figure 4 is a section along the line 4 4 in Figure 2.

Figure 5 is a section along the line 5-5 in Figure 2.

In carrying out my invention I provide a housing shown generally at 6 and having a Venturi chamber 'I of oval cross section open at its frontal end 8. At the rear end the housing has an upwardly extended and flared fuel inlet nipple or mouth 9 interiorly threaded as shown 'at IIJ and with its lower wall portion II disposed at about the level of the upper wall of the chamber 1. A partition wall I2 extends downwardly from this lower portion II of the mouth 9 to the lower wall of the chamber 'I and thus forms a premixing chamber I3 the upper frontal portion of which is enclosed by the inclined neck I4 joining the mouth 9 to the chamber 1.

A steam inlet mouth I5 is formed below the fuel inlet 9 and communicates with the housing by a neck I6 which inclines upwardly to a point behind the partition wall I2 and terminates in a back wall or web I1 extending in spaced relation behind the wall I2 in spaced parallel relation thereto forming a steam chamber I8'. This steam inlet I5 is also interiorly threaded as shown at The partition wall I2 has laterally spaced steam inlet ports 20 leading from the steam chamber I8 to the premixing chamber I3 and the back wall I1 has aligned tapped openings 2l in which plugs 22 are screwed, these plugs having the ilatted heads 23 disposed to the rear.

A pair of Venturi tubes 24 are mounted side by side in parallel relation in the chamber 1 5 wherein they are held by set screws 25 threaded down through the upper wall of the chamber as shown. These tubes 24 have the Venturi passages of the usual shape including the converging mouths 26, restricted necks 21 and flaring throats 10 28, the latter being turned forwardly. The Venturi passages might also be'formed in the housing itself in lieu of the use of separate tubes if so desired.

A combination final mixing or discharge cham- 15 ber and burner nozzle 29 is provided, the same being o-f oval cross section with a rear anged mounting end 30 which is secured in any suitable manner, as by screws 3 I, to the frontal end of the chamber I so that the throats 28 of the Venturi 20 tubes 24 open into the nozzle. The frontal end of the nozzle is tapered as at 32 and has an elongated narrow slot 33. A dividing web or n 34 extended vertically in the muzzle 39 fits between the inner edges of the forward ends of the throats 25 28 and its frontal edge is beveled off as at 35.

A liquid or viscous fuel o-f any well known kind is forced into the burner through a pipe (not shown) screwed into the fuel inlet 9 and steam is forced to the burner under pressure through a 30 pipe (not shown) screwed into the inlet I 5.

Now as the steam enters it rushes through the ports 20 into the chamber I3 where it strikes the fuel which is directed down into this chamber by the neck I4 and the resulting turbulence 35 causes a thorough mixing of the steam and fuel. The resulting mixture then passes throughthe Venturi tubes 24 going through a further mixing therein and emerging from the throats 23 in two stre-ams these mingle to complete the mixing op- 40 eration. 'I'he fuel may then be burned at the slot 33.

The plugs 22 may be replaced `by a bushing like member that carries a suitable adjusting member that is used to regulate the amount of steam pass- 45 ing through ports 20. These regulating members may be individually adjusted or they may be made to operate simultaneously through gearing, linkage or other suitable mechanisms.

Of course any number of Venturi tubes may be 50 used in lieu of the two shown and other changes may be made in the mechanical arrangement of the parts as may be found desirable or suitable.

While I have herein set forth a certain preferred embodiment of my invention it is under- 55 stood that I may vary from the same in minor structural details so as best to provide a practical device for the purposes intended, not departing from the spirit of the invention and Within the scope of the appended claim.

I claim:

In `a burner, an elongate housing having a cross-sectionally ovate Venturi-tube chamber extended longitudinally therethrough, a pair of Venturi tubes mounted side .bywside through the housing .at the-ends of the long transverse axis thereof, the said housing including a common mixing chamber at the fuel inlet ends ci the tubes and a separate steam chamber rearwardly of the mixing chamber, the separating Wall between the mixing chamber and steam chamber being -pierced by steam ports cci-axially aligned with the said Venturi tubes, a steam inlet pipe leading into the steam chamber and a fuel inlet pipe leading into the mixing chamber trans- Versely of the steam ports piercing the separating Wall o-f the-,mixing chamber and-the steam chamber.v f

:HO-MER P. PARRIGIN. 

